linux-kernel - Re: [PATCH 14/23] io-conroller: Prepare elevator layer for single queue schedulers

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Message-ID: <4A9B3A24.7050202@redhat.com>
Date:	Sun, 30 Aug 2009 22:49:08 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	linux-kernel@...r.kernel.org, jens.axboe@...cle.com,
	containers@...ts.linux-foundation.org, dm-devel@...hat.com,
	nauman@...gle.com, dpshah@...gle.com, lizf@...fujitsu.com,
	mikew@...gle.com, fchecconi@...il.com, paolo.valente@...more.it,
	ryov@...inux.co.jp, fernando@....ntt.co.jp, s-uchida@...jp.nec.com,
	taka@...inux.co.jp, guijianfeng@...fujitsu.com, jmoyer@...hat.com,
	dhaval@...ux.vnet.ibm.com, balbir@...ux.vnet.ibm.com,
	righi.andrea@...il.com, m-ikeda@...jp.nec.com, agk@...hat.com,
	akpm@...ux-foundation.org, peterz@...radead.org,
	jmarchan@...hat.com, torvalds@...ux-foundation.org, mingo@...e.hu
Subject: Re: [PATCH 14/23] io-conroller: Prepare elevator layer for single
 queue schedulers

Vivek Goyal wrote:
> Elevator layer now has support for hierarchical fair queuing. cfq has
> been migrated to make use of it and now it is time to do groundwork for
> noop, deadline and AS.
> 
> noop deadline and AS don't maintain separate queues for different processes.
> There is only one single queue. Effectively one can think that in hierarchical
> setup, there will be one queue per cgroup where requests from all the
> processes in the cgroup will be queued.
> 
> Generally io scheduler takes care of creating queues. Because there is
> only one queue here, we have modified common layer to take care of queue
> creation and some other functionality. This special casing helps in keeping
> the changes to noop, deadline and AS to the minimum.
> 
> Signed-off-by: Nauman Rafique <nauman@...gle.com>
> Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>
> Signed-off-by: Vivek Goyal <vgoyal@...hat.com>

Acked-by: Rik van Riel <riel@...hat.com>

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